Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6594465ba53497…

MALICIOUS

PDF

78.7 KB Created: 2021-03-23 08:56:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 036043dc0651958b7a0e8319277f67cb SHA-1: d6acacf0057d8bcb825f72afca18574cbde8557b SHA-256: 3b6594465ba534975ae4c3b0c35f1a41675327b51f7f848873edf142e7309e10
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to manipulate search engine results. The presence of 'cmd_commands_list_disk.pdf' and the ML classifier's high confidence score indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest it's designed to redirect users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/award?keyword=technical+office+manager+job+description+pdf
    • https://gaturavokig.weebly.com/uploads/1/3/4/3/134317265/4085821.pdf
    • https://sopazavevorud.weebly.com/uploads/1/3/4/3/134370644/4464689.pdf
    • https://giruwikepu.weebly.com/uploads/1/3/4/4/134464081/6882382.pdf
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/ed41eed.pdf
    • https://dodikajopofibu.weebly.com/uploads/1/3/4/7/134704264/mopesojopinidof.pdf
    • https://pudoxarunisit.weebly.com/uploads/1/3/1/1/131164251/waxujo-womopiz-xefufugesi-ginasefof.pdf
    • https://marikiwow.weebly.com/uploads/1/3/1/3/131379510/3fba79a032a177.pdf
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/piraregipim-buruduluni-pezarajakeja-guvukixori.pdf
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/9785734.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://rezugarufubibif.rf.gd/cmd_commands_list_disk.pdf
    • http://tazigedefabe.rf.gd/belenujofidafovebujemide.pdf
    • https://s3.amazonaws.com/rodiligarexo/21616041692.pdf
    • http://bumigujawew.rf.gd/neladezuluwekavek.pdf
    • https://1ee34b3e-bfcb-4e25-b227-79ffd44eef10.filesusr.com/ugd/9d5096_45690823860844449f0b10edc6ea33f1.pdf?index=true
    • http://xiditad.rf.gd/telirufukix.pdf
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_82ddafb1f8684767aae6a48b78df1064.pdf?index=true
    • https://s3.amazonaws.com/sazomo/kdigo_chronic_kidney_disease_guidelines.pdf
    • http://kajonefev.rf.gd/how_do_i_connect_my_hp_printer_to_my_phone_without_wifi.pdf
    • https://s3.amazonaws.com/zatasipezeg/xibuxijolajuv.pdf
    • https://s3.amazonaws.com/wanasuvedigo/scales_and_arpeggios_for_flute.pdf
    • https://s3.amazonaws.com/dupula/conceptual_physics_lab_answers.pdf
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_5c6781e025fb40f48296949b9172689c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://tazigedefabe.rf.gd/belenuj
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e981.bin
74fa5b785835224e5910d2209dfe2a408abc75f081752d60a11f32e356aa6e94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 5520 bytes
font_01_sfnt_off0000fc0a.bin
4cf2c3f84428f8718b57f1c1fb56f71f7c4537426309202b21d487f6498c21a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0A 10296 bytes
font_02_sfnt_off00011f40.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F40 4324 bytes

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